Neoclassical theory of alpha-particle transport in the central region of a tokamak plasma

Abstract

A neoclassical theory applicable to the central region of a reactor tokamak plasma is developed for high-energy alpha-particle transport processes. It is shown that in the neighbourhood of the magnetic axis (and on the axis itself), the alpha-particle bootstrap current and flux across the magnetic field are non-zero and may be comparable with the corresponding quantities in the region far from the axis.